Château de Potelle was built around 1290 by Gilles de Mortagne. It has been looted and damaged in wars (1477, 1654, 1712 and 1793). The last restoration was made in 1817. The gate house was erected in the 13th-14th centuries and may have been located to the site of ancient Roman castrum. The chapel was moved to the courtyard of in 1519. Today Château de Potelle is a private home.
References:The Clementinum is a historic complex of buildings in Prague. Until recently the complex hosted the National, University and Technical libraries, the City Library also being located nearby on Mariánské Náměstí. The Technical library and the Municipal library have moved to the Prague National Technical Library at Technická 6 since 2009. It is currently in use as the National Library of the Czech Republic.
Its history dates from the existence of a chapel dedicated to Saint Clement in the 11th century. A Dominican monastery was founded in the medieval period, which was transformed in 1556 to a Jesuit college. In 1622 the Jesuits transferred the library of Charles University to the Klementinum, and the college was merged with the University in 1654. The Jesuits remained until 1773, when the Klementinum was established as an observatory, library, and university by the Empress Maria Theresa of Austria.